It is migration time, so your birds may have left for better climates.
My DH noticed a robin (American Robin) in our yard looking a bit lethargic, so I kept an eye on him, and he hung about all day. He did get moving, and ate quite a few worms. I expect that he is taking a day off from migrating south to refuel, and perhaps hunker down from expected high winds. Somehow they seem to be good forecasters of weather.
Our robins are fun to watch because they hop around the lawn or garden, cock their heads to listen for bugs and worms, and are extremely accurate one they dive for a worm!
We had put out a block of suet which the Steller's Jays were enjoying, but then the dreaded flock of starlings took over and finished off the lot. They are an invasive introduced species here, so I don't encourage feeding them. I'll wait another week or until cooler weather to put out more suet.